CALORIMETRIC HEATS OF ADSORPTION AND ADSORPTION-ISOTHERMS .3. MIXTURES OF CH4 AND C2H6 IN SILICALITE AND MIXTURES OF CO2 AND C2H6 IN NAX

Individual heats of adsorption and selectivity of mixtures have been m easured simultaneously in a calorimeter. After the weakly adsorbed com ponent was preloaded the dosing of both components to the sample cell was adjusted to hold the loading of the weakly adsorbed component cons tant. Agreement with ideal adsorbed solution theory is quantitative fo r mixtures of CH4 and C2H6 at low coverage in an adsorbent with a weak electric field (silicalite). Mixtures of quadrupolar (CO2) and nonpol ar (C2H6) gases in an adsorbent with a strong electric field (NaX) exh ibit strong negative deviations from ideality. The experimental heats of adsorption are larger than those for an ideal solution, in agreemen t with the results of molecular simulation.